Keysight 86120D and 86122C Multi-Wavelength Meters User’s Guide 49
Getting Started 1
Laser Channel Flatness
You can use relative power measurements to measure flatness
(pre-emphasis) in a WDM system. Simply select one carrier as the
reference and measure the remaining carriers relative to the reference
level. The power differences represent the system flatness.
1Press and click
2 Select the channel with the largest amplitude as the reference by
clicking in the “Ref” column of that peak’s row.
3 To determine channel flatness from the reference, simply read the
relative power values in the “Delta Pwr” column.
Laser Channel Separation/Flatness
You can also measure channel separation and flatness at the same time.
Press and click
Laser Drift
Laser drift can be easily measured by using the drift application.
Press . and click
Signal-to-Noise Ratio
Signal-to-noise ratio can be easily measured by using the OSNR
application.
Press and click
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